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构成的巨大沙盘前。
要说严绍穿越到这个时代所带来的改变其实不算多，但是也绝对算不上少。
至少在一些他自认为合理，而且不会对自己造成不利影响的东西上，他一向是不吝于改变的。
比如说沙盘。。。
沙盘这个东西其实在古代就已经开始有了，但是这个时代的沙盘通常都很粗糙。
中国南朝宋范晔撰后汉书马援传已有记载：汉建武八年（公元32年）光武帝征伐天水、武都一带地方豪强隗嚣时，大将马援
“聚米为山谷，指画形势”，使光武帝顿有
“虏在吾目中矣”的感觉，这就是最早的沙盘作业。
直到1811年，普鲁士国王菲特烈威廉三世的文职军事顾问冯莱斯维茨，用胶泥制作了一个精巧的战场模型，用颜色把道路、河流、村庄和树林表示出来，用小瓷块代表军队和武器，陈列在波茨坦皇宫里，用来进行军事游戏。
后来，莱斯维茨的儿子利用沙盘、地图表示地形地貌，以算时器表示军队和武器的配置情况，按照实战方式进行策略谋划。
这种
“战争博弈”就是现代沙盘作业。
而严绍带来的改变，就是后一者。。。
古代沙盘弄起来比较费时，而且相较之下也没有比地图强出太多来，每到一个地方，又都还需要考察地势才可以，偏偏古代的王朝对于自己的国家，很少进行绘测，所拥有的地图都是非常简陋的那种，哪里会有资料弄沙盘？
所以真的动起手来，真正用的还是地图，只有在非常熟悉的一些地区又或者是一些关隘附近，才会有比较成熟的沙盘，嗯，这个成熟还是相对的。。。
相较之下，严绍就不会如此了。。。
在刚刚穿越过来的时候，严绍已经开始对这个时代的地图跟沙盘一头雾水。
讲道理，那些绘制非常简陋的地图，在他看来非常麻烦。只是那时他人微言轻，而且当时黄巾之乱也快要到结尾了，也就没有必要跑出来显摆自己的想法。
直到后来，他成了北海太守之后，才开始了绘测工作。简单些讲，就是派人在北海及青州境内，对地势进行考察和研究，最后整理出一个比较详细的地图出来。
同时也根据这些资料，弄出了一个又一个的小沙盘出来，这也是乌桓之乱的经验教训。
若是当时有足够多的沙盘，让严绍对整个北海甚至是整个青州都有足够的了解，那么在对付乌桓人的时候，便可以采取更主动的姿态一一一一尽管当时严绍已经干的很是不错了。
不过真正大规模的进行测绘工作，还是在严绍当上了青州牧以后。
成了青州牧后，严绍清楚自己接下来的任务是什么，派出了大量的探子到了临近的各个州，这其中尤其是以冀州、兖州和徐州为主。
这也是最有可能与严绍爆发冲突的三个州。
探子和间谍其实没什么区别，常人的思考当中，间谍的工作通常都和007有些类似，就算不是这样，起码也是高端大气上档次的那种，实际上间谍的工作涵盖面真的很广。
不仅有高端的007系列，也有其他的并不是那么很高端的工作，这其中就包括了之前提到的测绘。
早在清代，乃至是鸦片战争之前的乾隆时期，就已经有外国人在广州等通商地区进行秘密的测绘工作，到了一战和二战时，更是如此。
等到了后世，经常有非法测绘人员被抓获的消息。
没办法，这年头卫星确实多了，可是很多东西还是需要人用脚丫子去走，去测量的。。。
有了详细的数据，将来的战争之中也就可以更容易掌握主动权。
严绍派出的这些探子，不仅是需要打探一些情报，也需要进行测绘工作。
在严绍当上青州牧的这几年里，这些探子为严绍提供了大量的情报，严绍州牧府的其中几个房间里，堆满了临近州的沙盘。
都是根据探子们传回来的情报绘制的，这也让严绍在与对手们交手时，更能
嗯嗯，不好意思，后面的一定尽快补上！
！！
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第四百七十三章（）
袁绍与公孙瓒之间的冲突很快爆发，在兵力方面，袁绍本来就拥有着相当程度上的优势，再加上还有刘虞旧部的支持，对公孙瓒的优势更加扩大。
两相比较之下，可以想象公孙瓒的压力究竟有多巨大。
不过公孙瓒也算是一个沙场老将，不管作为一个君主，公孙瓒究竟有多么不称职，领军作战方面他还是没有什么太大问题的。
几次和袁绍的作战，都是亲自领兵冲锋陷阵，和袁绍到之间的胜负到是有来有往的
公孙瓒的营地中，兵马来回巡视，这时营寨外突然传来一阵马蹄声，负责把守营寨的军士向外看去，正好看到了公孙瓒领着一队骑军冲了回来。
“父亲，您回来啦！”早已立在营寨门外，公孙瓒的儿子迎了上来。
“嗯”从马背上翻身下来，公孙瓒一边解下身上的披风，一边对着自己的儿子公孙续道。
对于自己的父亲，公孙续有着近乎无限的崇敬，就好像每个儿子心中的父亲一样。公孙瓒的表现，似乎也没有辜负公孙续的这种期待，作为一个疆场上的将军，不敢说百战百胜，但是每战都势必冲杀在最前列，使得军心士气大振。
处于边疆的幽州在过去一直是